1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2bc8936ff4855815c550385bc2b69e48bcfa89576a718b58ccd85f3821915bca. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a390e9cc-b90a-469c-b675-870c44b9b51e.json and https://artists.proofprofile.net/proofs/artist/a390e9cc-b90a-469c-b675-870c44b9b51e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a6c80043aa21f9ea089ad2a026c88ab1074f6306b059130b52a3a941baf4fa. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2f67fba330ec89a134c6dc0cfb4e46864f234f6c1c9fa60222c84a1c874464c. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd209f3c5b34852366a3bc7cdd10399f43cc11fbae67c2b659c24a81f344f6c72. Chain 2 (Bitcoin): anchored in block 958819 (2026-07-20T04:08:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3da42dd22f68afbbe398dc6f9315b67fca6c6e62342a90b18fa233e57a23dc6. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1b99ed6be08f02bd2510205d00c3ce7f76f847970775bb0d6857f4dd757cbce. Chain 2 (Bitcoin): anchored in block 958246 (2026-07-16T05:55:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600713.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5778cd28b47714a7e60bc30b530c9ae125415849e7621d28ba574a7a6aa43d. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc25e6f1babf6822d66c4ef8a984d9a3e984072c8951e36adcb21de1935dca8. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf84b05d9d6d1f9e33bdc077a52a3e474ce1bb1fa5d05ee9d991aed42a3edeee. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0d7336fc8a3da742f931b9728466cd27dd0644a4777b22166f181d5a5ab51c. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0232f3abcfa58ea49f7850e39b43d808bfe9d52f940e38a079f7de5f489120. Chain 2 (Bitcoin): anchored in block 957744 (2026-07-12T19:15:44Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74426a5aa802a8e82ab0c7695280a755b3f4905a0d28453f461c033aac3dc46. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c9ce7b3cdb3b3e8f0000f8f03d769d5d86d67131f465d810f01750cf4f79848. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11a0c2510126090421f82b739a04396f627dd45d43f547b0f38de162c81d8175. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd810e96024eed1e9d8490b16ad7d7e94daf5cb0b292551f4c52d9ece4ac9d8b3. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6b071ed561628e942d0abb2cbe7c13b7633c98354ce9c4c107ce96499c1fef7. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z21600729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06722e7df4a030cef5b77e71ab0aa0b4934301355c0734208f269bbdb67b20dc. Chain 2 (Bitcoin): anchored in block 958706 (2026-07-19T08:50:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z22100039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a2228b4dd7921e36a75343344daae994cdbd385a39f4338f2c144e23266f3cc. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZ3Z22100170.